Skiving-machine



C. A. BLISS. smvme MACHINE. A APPLICATION FILED AUG-20, 1919. 1,341,164;, Patented May 25, 1920.

7 3 w w G w M W MW a l.. ww fl I /H j w HY 9 3 7 9 Mm; 1 m ww w 2 5 1 7%H UNITED STATES PATENT OFFICE- CHARLES A. BLISS, OF BRADFORD,MASSACHUSETTS, ASSIGNOB TO UNITED SHOE MACHINERY CORPORATION, 01PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SKIVING-MACHINE.

Specification of Letters Patent.

Patented May 25, 1920.

Application filed August 20, 1919. Serial No. 318,721.

To all whom it may concern:

Be it known that I, CHARLES A. Buss, a a

erating upon leather and similar material and is herein illustrated asembodied in a machine for skiving box toe and counter blanks for use inthe manufacture of boots and shoes. 1

A commonly used type of machine for performing such operations comprisesa bed or die roll having a cavity therein, a presser roll having aseries of toothed feed disks, and a knife the edge of which is locatedclose to and just in the rear of the bite of the rolls. Each blank ispresented to the machine in timed relation to the rotation of the rollsso as to be properly received in the die cavity. The blank is forceddown into the cavity by the action of the presser roll, and, as it isadvanced between the rolls, those portions which project above thecavity are cut off by the knife, the shape of the finished articledepending upon the shape of the cavity. I

With certain kinds of material, such as felt impregnated with astiffening substance of a tarry nature, it is difficult to force theblank firmly into the cavity and to feed it forward without slippage.Various constructions of presser roll have been used in attempts toovercome these diiliculties, among them the roll shown in the patent toGrant, No. 887 ,625, which is composed of alternately arranged toothedand rubber collars clamped togetherupon a shaft with their peripheriessubstantially flush with one another. This roll, however, has certaindisadvantages. First, when the sections are clamped together there is noprovision for applying a uniform, limited amount of pressure to therubber collars, with the result that the collars are compressed too muchor some of them are compressed more than others and their peripheries donot form part of a common cylinder. This may be due in part toinequalities in the rubber, but in any event the peripheries of therubber collars after they are clamped in place tend to be out ofalinement with one another so that there are bulges in the periphery ofthe roll. Second, with the rubber collars clamped as tightly as in thepatented roll, their resilience as they press upon the work is limitedto a small sector. Third, when such a roll is used upon a blank which isimpregnated with a tarry stiffening substance, the tarry substancesticks to and accumulates upon the rubber sections, and it isimpracticable to scrape off the coating as fast as it forms sincescrapers would injure the rubber.

The general object of the present invention is to overcome thesedifficulties as well as to provide a long-lived roll which can be usedon all sorts of materials. The roll of the present invention comprises aplurality of rigid toothed sections spaced apart by hubs thereon, aplurality of rubber washers of less diameter than the toothed sectionsarranged alternately between the sections, a plurality of metallicrings, the diameters of which are substantially equal to those of thetoothed sections, mounted on the washers, and a plurality of scrapersrunning in contact with the peripheries of the rings. With thisconstruction the rubber cannot be unduly compressed nor does it comeinto contact with the blank. It is hence not sub jected to the influenceof the tarry substance with which certain kinds of blanks areimpregnated, nor is the tarry substance permitted to collect in anyconsiderable amount upon the surface of the roll. The tendency of theiron rings to collect this substance is less than that of the rubbercollars of the patented roll, and what little collects is removed by thescrapers.

These and other features of the invention including certain details ofconstruction and combinations of parts will be described as embodied inan illustrative machine and pointed out in the appended claims.

Referring now to the accompanying drawings,

Figure 1 is a section of a portion of a skiving machine in which thepresent invention is embodied;

Fig. 2 is an elevation of a portion of the presser roll;

Fig. 3 is a plan of a portion of one of the combined scraping andstripping members; and

Fig. 4 is a section of the roll on the line 41 of Fig. 2 with the shaftomitted but with the combinedscraping and stripping member in position.

The illustrative machine has two rolls, a die or bed roll 5 having a diecavity 7, a presser roll9 and'a stationary knife 11 the edge ofwhich isclose to and in the rear of the bite of the rolls, the rolls beingdriven in the directions indicated by the arrows,

and the blanks, one of which is indicated at 100, being presented to therolls in timed relation: so asto be received properly in the cavity. Themachine, as thus far described, is of a wellknown type' such, forexample, as that shown in the patent to Grant referred to above, or toLane, No. 1,173,359, and will not be described further in detail. Itwill'be understood, however, that each blank is'forced into the diecavity and that the knife cuts ofl those portions of the blank whichproject above the cavity. In the ease of box toes and counter blanks,the cavities in the die rolls commonly are deepest at their middleportions and have one or more sloping sides, so that one or more longbevels are produced on the finished articles.

With machines of this general type considerable difficulty has beenexperienced in pressing the blanks firmly into the cavities and feedingthem to the lniife without slippage, and the present invention, as hasbeen explained, is designed to overcome these difficulties; In theillustrative machine the shaft 13 has keyed upon it a plurality oftoothed sections 150ne function of which is to feed the blank; and eachsection has a hub 115 which serves as a spacer so that, when thesections are clamped together between a collar 113 on one endof theshaft and a washer 16 and nut 17, the latter being threaded on the otherend of the shaft, the teeth of the toothed sections are spaced apartuniformly. The spacers 115 are shown as hubs'integral with the toothedsections, but obviously whether they are integral hubs or separatemembers is immaterial so long as the proper spacing of the toothedsections results. Mounted on each spacer is a rubber washer 19 of awidth very slightly greater than that of the spacer; and mount ed oneach washer is a metallic ring 21, preferably of spring steel, the widthof which is slightly less than that of the spacer. These variations inWidths are very small, that between the rings and the spacers, forexample, being about .one sixty-fourth of an inch. These variationsinsure first that the rubber Washers shall all be compressed uniformlyand to a small extent andthat the rings shall be free to yieldtransversely of the axis of the shaft. The diameter of the rings 2landby diameter is meant the outside diameter-is substantially the same asthat of the toothed sections so that when the teeth sink into the blankthe rings exert a yielding pressure upon the blank to force it into thedie cavity.

A common form .of box toe blank now in use is made of felt or a feltlike material impregnated with a tarry stiffening material; and, whensuch blanks are operated upon, the presser roll rapidly becomes coatedwith the stiffening material. In order to clean off any such material aswell as to strip the skivingsfrom the roll, a plurality of combinedstripping and scraping members- 23 are provided. Each scraper is formedat the end of an arm which projects from a hub 123 through which passesa rod 25, spacing washers, not shown, being placed between the hubs.Normally the hubs and Washers are clamped together by means of nuts 27at each end of the red; but, by loosening the nuts, independentadjustment of the scrapers with respect to the periphery of the roll ispermitted. In order to prevent displacement of the scrapers when thenuts are rotated, stationary washers are formed on thelower ends ofplates 29 which are rigidly fastened to stationary brackets 31.Provision is also made for adjusting the scrapers in unison angularlyabout the axis of the rod 25 by manipulating screw-bolts 33, the wholemounting of the scrapers bcing substantially like the mounting of thepresser fingers 14.- of the patent to Lane. Each ring 21 has a portionof reduced diameter so that grooves 35 are formed at one side of eachtoothed section 15 between the section and the adjacent ring 21. Eachmember 23 (see Fig. 8) is cut away at its operative end .to form afinger 37, which onters a groove 35, and a scraping edge 39.

which contacts with the periphery of the ad jacent ring 21. With thisconstruction the peripheries of the rings 21 are kept clean and theskivings are stripped from the roll.

In the operation of the machine the blanks are presented one by one intimed relation so as to be properly received in the die cavity. J-is'theteeth of the sections 15 sink into the blank, the rings yieldtransversely of the axis of the shaft and, in connection with thetoothed sections, press the blank firmly into the cavity. As the blankis fed to the knife, the projecting portions are cut off. It shouldbe'noted that the rubber washers 19 are only slightly compressed adirection parallel to the axis of the shaft, that this compression isuniform, and

that consequently they yield uniformly throughout a comparatively largesector in response to pressure of the blank upon the rin 21. It shouldalso be noted that the rub er is never in contact with the blank andtherefore enjoys a much longer life than would otherwise be the case.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A feed and pressure roll comprising a rotary shaft, a series ofrigid, toothed, spaced sections aflixed to the shaft and a series ofyielding members alternating with the rigid sections, the width of theyielding members being of less extent than that of the spaces betweenthe toothed sections.

2. A feed and pressure roll comprising a rotary shaft, a series ofrigid, toothed, spaced sections afiixed to the shaft, a series ofyielding members alternating with the rigid sections, the width of theyielding members being of less extent than that of the spaces betweenthe toothed sections there being grooves between the toothe sections andthe ielding members, and a plurality of combined stripping and scrapingmembers having fingers extending into the grooves and scraping edges incontact with the peripheries of the yielding members.

3. A feed and pressure roll the operative face of which is formed by theperipheries of alternating rigid and yielding members, the rigid membershaving teeth adapted to enter the material to be operated upon and beingspaced apart a uniform distance, the yielding members comprising elasticcushions located between the toothed members and metallic members ofless width than the spaces between the toothed members mounted on thecushions.

4. A feed and pressure roll the operative face of which is formed by theperipheries of alternating rigid and yielding members, the rigid membershaving teeth adapted to enter the material to be operated upon and beingspaced apart a uniform distance, the yielding members comprising elasticcushions located between the toothed members and metallic members ofless width than the spaces between the toothed members mounted on thecushions, and scrapers in contact with the peripheries of the metallicmembers.

5. A feed and pressure roll comprising a shafna plurality of rigidtoothed sections keyed thereon in spaced relation, a plurality of rubberwashers of less diameter than the toothed sections mounted between saidsections, a plurality of metallic rings the outside diameters of whichare substantially equal to those of the sections mounted on the washers,and means for holding the sections, washers and rings in place.

6. A feed and pressure roll comprising a shaft, a plurality of rigidtoothed sections keyed thereon in spaced relation, a plurality of rubberwashers of less diameter than the toothed sections mounted between saidsections, a plurality of metallic rings the outside diameters of-whichare substantially equal to those of the sections mounted on the washers,means for holding the sections, washers and rings in place, and scrapersin contact with the peripheries of the rings.

7. A feed and pressure roll comprising a rotary shaft, a series ofrigid, toothed, spaced sections mounted thereon, a series of rubbercushions of a width slightly greater than that of the spaces and of adiameter less than that of the toothed sections mounted between thesections, a plurality of metallic pressure members of a width less thanthat of the spaces mounted on the cushions, and means for clamping therubber cushions between the toothed sections and for fastening thetoothed sections to the shaft.

8. A machine of the class described having, in combination, a die rollhaving a cavity therein, a feed and pressure roll cooperating therewith,and a knife located in the rear of the rolls, the feed and res sure rollcomprising a rotary shaft, a series of spaced serrated feed membersmounted thereon, a series of presser members movable in the spacesbetween the serrated members, and yielding means constructed andarranged to maintain the peripheries of the presser members normallysubstantially flush with the points of the serrations and to permit thepresser members to yield to force exerted in a direction transverse tothe axis of the shaft.

9. A machine of the class described, having, in combination, a die rollhaving a cavity therein, a feed and pressure roll cooperating therewith,a knife located in the rear of the rolls, the feed and pressure rollcomprising a rotary shaft, a series of spaced serrated feed membersmounted thereon, a series of presser members movable in the spacesbetween the serrated members, and yielding means constructed andarranged to maintain the peripheries of the presser members normallysubstantially flush with the points of the serrations and to permit thepresser members to yield to force exerted in a direction transverse tothe axis of the shaft, and scraping means in contact with theperipheries of the presser members.

In testimony whereof I have signed my name to this specification.

CHARLES A. BLISS.

